Actually Return of the Living Dead Necropolis was pretty good.

I watched pieces of 4 and 5 and they seemed pretty bad. I love the original, and the second one isn't great but watchable with some laughs. The third one to me is pretty good but just totally different in tone. Kinda funny seeing the chick from The O.C. in the 3rd one as well. Wish they would release the 3rd one uncut - I have the uncut vhs but havent gotten around to burning it to disc yet.